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Mixing Oils
Is a 15W-50 Oil Too Thick for Cold Temperatures, and Would Mixing with 0W-40 be Better?
I have a supercharged 2001 BMW 330ci with 107,000 miles on it. It has always burned oil, even when new. Now, however, it burns a quart in only 650 miles. I was told I should have been using 15W-50 syn...
New Jersey has cold enough winters that we recommend you continue to use 0W-40 at least in the winter. In the spring, summer and fall you can use Mobil 1 15W-50 and see if this improves your oil consu...
Will Mixing Synthetic with Conventional Oil Cause a Gel to Form?
I mixed Mobil 1 with regular motor oil.  My mechanic told me I should not do this because it forms a gel; is this true? I did it on 3 Honda Accords - a 2003 with 40,000 miles, a 1990 with 201,000 mile...
In general, oils should be compatible with each other. It is not likely that you would form gel by mixing the two oils. However, we would not recommend mixing oils as a general practice because oils a...
Can Leftover Oil be Combined and Used in the Next Oil Change?
After the tech puts in about 4 quarts of Mobil 1 in my car, he invariably leaves a little oil at the bottom of each bottle. So I was wondering if you can combine the leftover Mobil 1 in each bottle in...
There is no problem with conserving oil.  Use the leftover oil in your next oil change.
12/ 21/2006
Does Inadvertently Adding Transmission Fluid to Oil Cause Problems?
What happens if you accidentally add Mobil 1 synthetic transmission multi-vehicle formula to a car that has Mobil 1 oil? Will I screw up the engine? I accidentally added one quart to my car.
It is unlikely that you will cause any damage with this mistake, but since the transmission fluid is a light viscosity, you need to check your oil level.  We suggest you change the oil as soon as you ...
Mixing Synthetic and Conventional Motor Oils
Can you ever blend synthetic oils and conventional oils? If so, what is the ratio?
Yes, synthetic oils can be blended with conventional oils. Several companies, including ExxonMobil, market synthetic blends which are a combination of synthetic and conventional oils. In the case of E...
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